Electric polishing gun

ABSTRACT

An electric polishing gun has a body, a rechargeable battery, a drive motor, a transmitting device and an actuating device. The body has a battery seat, a handle section, a circuit board, a switch, a trigger and a holding cap. The rechargeable battery is attached detachably to the battery seat of the body to supply electric power to the electric polishing gun. The drive motor is mounted in the body, is electrically connected to switch, the trigger and the rechargeable battery and has a rotating shaft and multiple engaging teeth. The transmitting device is connected to the drive motor, is mounted in the holding cap and has a bevel gear and a mounting bracket. The actuating device is connected detachably to the transmitting device and has a cover, a drive shaft, an eccentric segment and an actuating segment.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a polishing gun, and more particularly relates to an electric polishing gun that can be used conveniently and easily.

2. Description of Related Art

Conventional polishing guns are usually used to grind and polish surfaces of wood or metal and include manual and automatic types. An automatic type of conventional polishing gun can be driven by a pneumatic or electric power. However, the conventional pneumatic or electric polishing gun has a complicated structure, a large volume and a heavy weight.

Furthermore, the conventional pneumatic or electric polishing gun needs to connect with a power source and a user cannot bring the conventional pneumatic or electrical polishing gun to any desired location, and this is inconvenient in use.

To overcome the shortcomings, the present invention provides an electric polishing gun to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an electric polishing gun that can be used conveniently and easily.

The electric polishing gun in accordance with the present invention has a body, a rechargeable battery, a drive motor, a transmitting device and an actuating device. The body has a battery seat, a handle section, a circuit board, a switch, a trigger and a holding cap. The rechargeable battery is attached detachably to the battery seat of the body to supply electric power to the electric polishing gun. The drive motor is mounted in the body, is electrically connected to switch, the trigger and the rechargeable battery and has a rotating shaft and multiple engaging teeth. The transmitting device is connected to the drive motor, is mounted in the holding cap and has a bevel gear and a mounting bracket. The actuating device is connected detachably to the transmitting device and has a cover, a drive shaft, an eccentric segment and an actuating segment.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electric polishing gun in accordance with the present invention;

FIG. 2 is a side view in partial section of the electric polishing gun in FIG. 1;

FIG. 3 is an enlarged side view of the electric polishing gun in FIG. 1;

FIG. 4 is an enlarged perspective view of the electric polishing gun in FIG. 1; and

FIG. 5 is an exploded perspective view of the electric grinding gun in FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1 and 2, an electric polishing gun in accordance with the present invention comprises a body (10), a rechargeable battery (20), a drive motor (30), a transmitting device (40) and an actuating device (50).

The body (10) is hollow, is implemented with two half-casings (11) and has a top end, a lower end, a middle, a battery seat (12), a handle section (13), a circuit board (14), a switch (15), a speed governor (16), a trigger (17), a holding cap (18) and an auxiliary handle (19).

The battery seat (12) is obliquely formed on the lower end of the body (10).

The handle section (13) is defined in the middle of the body (10) and has a top end, a lower end, a front, a rear, a mounting recess (131) and a chamber (132). The mounting recess (131) is formed in the lower end of the handle section (13) near the battery seat (12). The chamber (132) is formed in the top end of the handle section (13) and communicates with the mounting recess (131).

The circuit board (14) is mounted in the mounting recess (131).

The switch (15) is mounted in the mounting recess (131), is electrically connected to the circuit board (14) and has a driven pin extending out of the body (10).

The speed governor (16) is rotatably mounted in the rear of the handle section (13) and is electrically connected to the circuit board (14) to adjust the rotating speed of the drive motor (30).

The trigger (17) is mounted pivotally on the front of the handle section (13) and contacts with the driven pin of the switch (15) when the trigger (17) being pulled and has a locking element (171). The locking element (171) is movably mounted in the front of the handle section (13) by a spring (172) to make the trigger (17) contacting with the front of the handle section (13) when the user presses the trigger (17).

The holding cap (18) is connected to the top end of the body (10) by multiple fasteners and has a front end, an opening and a sidewall. The opening is formed in the front end of the holding cap (18).

The auxiliary handle (19) is mounted on and protrudes from the sidewall of the holding cap (18). Then, a user can hold the electric polishing gun with both hands on the handle section (13) and the auxiliary handle (19).

The rechargeable battery (20) is attached detachably to the battery seat (12) of the body (10) and electrically connected to the circuit board (14) to supply electric power to the electric polishing gun.

The drive motor (30) is mounted in the chamber (14) of the body (10), is electrically connected to switch (15), the trigger (17) and the rechargeable battery (20) via the circuit board (14) and has an upper end, a rotating shaft (31) and multiple engaging teeth (32).

The rotating shaft (31) is rotatably connected to the upper end of the drive motor (30) and has an external surface and a top end.

The engaging teeth (32) are formed around the external surface of the rotating shaft (31) near the top end.

With reference to FIGS. 3 to 5, the transmitting device (40) is connected to the drive motor (30), is mounted in the holding cap (18) of the body (10) and has a bevel gear (41) and a mounting bracket (42).

The bevel gear (41) is rotatably mounted in the holding cap (18) from the opening and has a rear side, a center, multiple engaging teeth (411), a mounting hole (412) and a keyhole (413). The engaging teeth (411) are formed on the rear side of the bevel gear (41) and engage the engaging teeth (32) of the drive motor (30). The mounting hole (412) is formed through the center of the bevel gear (41). The keyhole (413) is formed through the bevel gear (41) and communicates with the mounting hole (412).

The mounting bracket (42) is mounted on the front end of the holding cap (18) of the body (10) by multiple fasteners to hold the bevel gear (41) between the holding cap (18) and the mounting bracket (42) and has a front end and a mounting barrel (421). The mounting barrel (421) is formed on the front end of the mounting bracket (42).

The actuating device (50) is connected detachably to the transmitting device (40) and has a cover (51), a drive shaft (52), an eccentric segment (53) and an actuating segment (54).

The cover (51) is mounted around the mounting bracket (42), communicates with the opening of the holding cap (18) and has a rear end and a collar (511). The collar (511) is formed on the rear end of the cover (51) and is mounted around the mounting barrel (421) of the mounting bracket (42).

The drive shaft (52) is mounted securely in the bevel gear (41) from the cover (51) and the holding cap (18) and has an external surface, an engaging end (521), a threaded end (522) and a key block (523). The engaging end (521) of the drive shaft (52) extends through the cover (51) and the front end of the mounting bracket (42) and is mounted in the mounting hole (412) of the bevel gear (41). The threaded end (522) of the drive shaft (52) extends through the collar (511) of the cover (51) and is mounted in the cover (51). The key block (523) is formed on and protrudes from the external surface of the drive shaft (52) near the engaging end (521) and engages the keyhole (413) in the bevel gear (41) to connect the drive shaft (52) with the bevel gear (41).

The eccentric segment (53) is connected to the drive shaft (52) and has a rear eccentric wheel (531), a front eccentric wheel (532) and two balancing elements (535). The rear eccentric wheel (531) is mounted around the threaded end (522) of the drive shaft (52) and has a rear side, a front side, an external surface and a screwed hole (533). The screwed hole (533) is eccentrically formed in the rear side of the rear eccentric wheel (531) and is screwed with the threaded end (522) of the drive shaft (52). The front eccentric wheel (532) is eccentrically formed on the front side of the rear eccentric wheel (531) and has a front side, an external surface and a connecting hole (534). The connecting hole (534) is formed in the front end of the front eccentric wheel (532). The balancing elements (535) are respectively mounted on the external surfaces of the eccentric wheels (531, 532).

The actuating segment (54) is connected detachably to the eccentric segment (53) and has a panel (541) and a polishing element (542). The panel (541) is connected detachably to the front eccentric wheel (532) and has a rear side, a front side and a connecting rod (543). The connecting rod (543) is formed on and protrudes from the rear side of the panel (541) and is mounted in the connecting hole (534) of the front eccentric wheel (532). The polishing element (542) is mounted around the front side of the panel (541) and can be a sponge or a wax paper sheet.

With reference to FIGS. 2 to 4, when a person holds the handle section (13) of the body (10) and pulls the trigger (17), the switch (15) and the circuit board (14) will drive the drive motor (30) to operate. The drive motor (30) is supplied power by the rechargeable battery (20). When the trigger (15) is pulled, the rotating shaft (31) of the drive motor (30) will drive the drive shaft (52) to rotate with the transmission of the engaging teeth (32, 411) on the rotating shaft (31) and the bevel gear (41). Then, the eccentric segment (53) and the actuating segment (54) connected to the threaded end (522) of the drive shaft (52) can be rotated to grind and polish surfaces of wood or metal with the polishing element (542) conveniently and easily. Furthermore, with the rechargeable battery (20), to connect an external power source is unnecessary, so the electrical polishing gun can be carried to any desired location for operation and is convenient in use.

The electric polishing gun as described has the following advantages.

1. The body (10), the rechargeable battery (20), the drive motor (30), the transmitting device (40) and the actuating device (50) are composed to form a simplified, a small volume and a lightweight electric polishing gun.

2. The electrical polishing gun can be carried to any desired location for operation and is convenient in use.

3. The polishing gun can easily and conveniently grind and polish surfaces of wood or metal by pulling the trigger (17).

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

1. An electric polishing gun having a body having a top end; a lower end; a middle; a battery seat being obliquely formed on the lower end of the body; a handle section being defined in the middle of the body and having a top end; a lower end; a front; a rear; a mounting recess being formed in the lower end of the handle section near the battery seat; and a chamber being formed in the top end of the handle section and communicating with the mounting recess; a circuit board being mounted in the mounting recess; a switch being mounted in the mounting recess and being electrically connected to the circuit board; a trigger being mounted in the front of the handle section and contacting with the switch when being pulled; and a holding cap being connected to the top end of the body and having a front end; an opening being formed in the front end of the holding cap; and a rechargeable battery being attached detachably to the battery seat of the body and electrically connected to the circuit board to supply electric power to the electric polishing gun; a drive motor being mounted in the chamber of the body, being electrically connected to switch, the trigger and the rechargeable battery and having an upper end; a rotating shaft being rotatably connected to the upper end of the drive motor and having an external surface; and a top end; and multiple engaging teeth being formed around the external surface of the rotating shaft near the top end of the rotating shaft; a transmitting device being connected to the drive motor, being mounted in the holding cap of the body and having a bevel gear being rotatably mounted in the holding cap from the opening and having a rear side; a center; multiple engaging teeth being formed on the rear side of the bevel gear and engaging the engaging teeth of the drive motor; and a mounting hole being formed through the center of the bevel gear; and a mounting bracket being mounted on the front end of the holding cap of the body to hold the bevel gear between the holding cap and the mounting bracket; and an actuating device being connected detachably to the transmitting device and having a cover being mounted around the mounting bracket and communicating with the opening of the holding cap; a drive shaft being mounted securely in the bevel gear from the cover and the holding cap and having an external surface; an engaging end extending through the cover and the front end of the mounting bracket and being mounted in the mounting hole of the bevel gear; and a threaded end extending through the collar of the cover and being mounted in the cover; an eccentric segment being connected to the threaded end of the drive shaft; and an actuating segment being connected detachably to the eccentric segment.
 2. The electric polishing gun as claimed in claim 1, wherein the eccentric segment has a rear eccentric wheel being mounted around the threaded end of the drive shaft and having a rear side; a front side; an external surface; and a screwed hole being eccentrically formed in the rear side of the rear eccentric wheel and being screwed with the threaded end of the drive shaft; and a front eccentric wheel being eccentrically formed on the front side of the rear eccentric wheel and having a front side; an external surface; and a connecting hole being formed in the front end of the front eccentric wheel; and the actuating segment has a panel being connected detachably to the front eccentric wheel and having a rear side; a front side; and a connecting rod being formed on and protruding from the rear side of the panel and being mounted in the connecting hole of the front eccentric wheel; and a polishing element being mounted around the front side of the panel.
 3. The electric polishing gun as claimed in claim 2, wherein the eccentric segment further has two balancing elements being respectively mounted on the external surfaces of the eccentric wheels.
 4. The electric polishing gun as claimed in claim 3, wherein the bevel gear further has a keyhole being formed through the bevel gear and communicating with the mounting hole; and the drive shaft further has a key block being formed on and protruding from the external surface of the drive shaft near the engaging end and engaging keyhole in the bevel gear to connect the drive shaft with the bevel gear.
 5. The electric polishing gun as claimed in claim 4, wherein the body further has a speed governor being rotatably mounted in the rear of the handle section and being electrically connected to the circuit board to adjust a rotating speed of the drive motor; and the trigger further has a locking element being movably mounted in the front of the handle section by a spring to make the trigger contacting with the front of the handle section when pressing the trigger.
 6. The electric polishing gun as claimed in claim 5, wherein the body further has an auxiliary handle being mounted on and protruding from the sidewall of the holding cap.
 7. The electric polishing gun as claimed in claim 6, wherein the holding cap is connected to the top end of the body by multiple fasteners; and the mounting bracket is mounted on the front end of the holding cap of the body by multiple fasteners to hold the bevel gear between the holding cap and the mounting bracket.
 8. The electric polishing gun as claimed in claim 7, wherein the mounting bracket has a front end; and a mounting barrel being formed on the front end of the mounting bracket; and the cover has a rear end; and a collar being formed on the rear end of the cover and being mounted around the mounting barrel of the mounting bracket.
 9. The electric polishing gun as claimed in claim 8, wherein the body is hollow and is composed of two half-casings.
 10. The electric polishing gun as claimed in claim 9, wherein the polishing element is a sponge.
 11. The electric polishing gun as claimed in claim 9, wherein the polishing element is a wax paper sheet.
 12. The electric polishing gun as claimed in claim 1, wherein the bevel gear further has a keyhole being formed through the bevel gear and communicating with the mounting hole; and the drive shaft further has a key block being formed on and protruding from the external surface of the drive shaft near the engaging end and engaging keyhole in the bevel gear to connect the drive shaft with the bevel gear.
 13. The electric polishing gun as claimed in claim 1, wherein the body further has a speed governor being rotatably mounted in the rear of the handle section and being electrically connected to the circuit board to adjust a rotating speed of the drive motor; and the trigger further has a locking element being movably mounted in the front of the handle section by a spring to make the trigger contacting with the front of the handle section when pressing the trigger.
 14. The electric polishing gun as claimed in claim 1, wherein the body further has an auxiliary handle being mounted on and protruding from the sidewall of the holding cap.
 15. The electric polishing gun as claimed in claim 1, wherein the holding cap is connected to the top end of the body by multiple fasteners; and the mounting bracket is mounted on the front end of the holding cap of the body by multiple fasteners to hold the bevel gear between the holding cap and the mounting bracket.
 16. The electric polishing gun as claimed in claim 1, wherein the mounting bracket has a front end; and a mounting barrel being formed on the front end of the mounting bracket; and the cover has a rear end; and a collar being formed on the rear end of the cover and being mounted around the mounting barrel of the mounting bracket.
 17. The electric polishing gun as claimed in claim 1, wherein the body is hollow and is composed of two half-casings. 